[time-nuts] HP-531xx calibrator nearing completion

Mark Sims holrum at hotmail.com
Sat Sep 9 00:48:31 EDT 2017

My doubler circuit is just a 74HC86.  One gate connects to the input 10 MHz signal  and is used as the squarer / buffer.  I'm using the squarer from the LPRO-101 manual / Wenzel web site.  It can be configured as either version shown in the LPRO manual, or a hybrid of the two.

Two gates are used as a delay line.  The squared signal and the delayed signal go the 4th XOR gate.  The output is a narrow pulse that clocks a 74AC74 D flip flop to get complementary 10 MHz outputs.

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